## https://yukicoder.me/problems/no/1996

MOD = 10 ** 9 + 7 

class BinaryIndexTree:
    """
    フェニック木(BinaryIndexTree)の基本的な機能を実装したクラス
    """
    def __init__(self, size):
        self.size = size
        self.array = [0] * (size + 1)
    
    def add(self, x, a):
        index = x
        while index <= self.size:
            self.array[index] += a
            self.array[index] %= MOD
            index += index & (-index)
    
    def sum(self, x):
        index = x
        ans = 0
        while index > 0:
            ans += self.array[index]
            ans %= MOD
            index -= index & (-index)
        return ans

    def least_upper_bound(self, value):
        if self.sum(self.size) < value:
            return -1
        elif value <= 0:
            return 0

        m = 1
        while m < self.size:
            m *= 2

        k = 0
        k_sum = 0
        while m > 0:
            k0 = k + m
            if k0 < self.size:
                if k_sum + self.array[k0] < value:
                    k_sum += self.array[k0]
                    k += m
            m //= 2
        if k < self.size:
            return k + 1
        else:
            return -1


def main():
    N, K = map(int, input().split())
    A = list(map(int, input().split()))
    S = input()

    # 座標圧縮
    a_list = list(set(A))
    a_list.sort()
    a_map = {}
    for i, a in enumerate(a_list):
        a_map[a] = i + 1
    a_max = len(a_list)

    dp_bits = [BinaryIndexTree(a_max) for _ in range(K + 1)]
    for a in A:
        a_ = a_map[a]
        for k in reversed(range(K + 1)):
            if k == 0:
                dp_bits[k].add(a_, 1)
            else:
                if S[k - 1] == "<":
                    x = dp_bits[k - 1].sum(a_ - 1)
                    dp_bits[k].add(a_, x)
                else:
                    x = dp_bits[k - 1].sum(dp_bits[k - 1].size) - dp_bits[k - 1].sum(a_)
                    x %= MOD
                    dp_bits[k].add(a_, x)
    print(dp_bits[-1].sum(dp_bits[-1].size))









if __name__ == "__main__":
    main()